mobile menu font color

Hi all
I’ve scoured the internet and haven’t found one solution that works (or maybe I’m missing something) but I can’t seem to change the color (
from red to black) of the nav/menu on the mobile version of my site
https://www.sscy.org/wp

I was able to change the desktop nav with some custom CSS, and I see there is a way to change link colors across the whole site on the appearance custom area but I only want to change the mobile nav for now.

I’m using twenty twenty theme.

Thanks in advance.

The page I need help with: [log in to see the link]